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Patent US4779954A successfully refreshed from Google Patents.
US4779954A
Expired / Lapsed
US
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Plastic optical fiber resistant to heat and humidity
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1987-06-19
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Granted: 1988-10-25
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Expires: 2007-06-19
Abstract
Abstract An optical fiber with low attenuation of light transmission comprising a core and a cladding, wherein the core is made of a polymer comprising units of deuterated methyl methacrylate containing 10 to 40% of a methacrylic ester the ester moiety of which has an alicyclic hydrocarbon group of from 6 to 20 carbon atoms, and the cladding is made of a transparent polymeric material having a refractive index of at least 3% smaller than that of the core, which optical fiber has excellent heat and humidity resistance as well as good flexibility.
Inventors
- 👤 Yoshiharu Tatsukami
- 👤 Katsuramaru Fujita
- 👤 Motonobu Furuta
- 👤 Toshifumi Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:10
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/045; G02B1/046; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
An optical fiber with low attenuation of light transmission and good heat and humidity resistance comprising a core and a cladding, wherein the core comprises a core polymer comprising units of deuterated methyl methacrylate and 10 to 40% of units of a methacrylic ester, the ester moiety of which has an alicyclic hydrocarbon group of from 6 to 20 carbon atoms, and the cladding comprises a transparent polymeric material having a refractive index at least 3% smaller than that of the core polymer.
Claim 2
Dependent Claim
83 words
An optical fiber with low attenuation of light transmission and good heat and humidity resistance comprising a core and a cladding, wherein the core comprises a core polymer comprising units of deuterated methyl methacrylate and 10 to 40% of units of a methacrylic ester, the ester moiety of which has an alicyclic hydrocarbon group of from 6 to 20 carbon atoms, and the cladding comprises a transparent polymeric material having a refractive index at least 3% smaller than that of the core polymer.
Claim 3
Dependent Claim
52 words
An optical fiber according to claim 1, wherein the methacrylate ester the ester moiety of which has an alicyclic hydrocarbon group of from 6 to 20 carbon atoms is selected from the group consisting of cyclohexyl methacrylate, methylcyclohexyl methacrylate, dimethylcyclohexyl methacrylate, bornyl methacrylate, fenchyl methacrylate, 1-menthyl methacrylate, adamantyl methacrylate and dimethyladamantyl methacrylate.
Claim 4
Dependent Claim
27 words
An optical fiber according to claim 2, wherein the deuterated methyl methacrylate is selected from the group consisting of methyl methacrylate-d 8 and methyl methacrylate-d 5 .
Claim 5
Dependent Claim
54 words
An optical fiber according to claim 1, wherein the transparent polymeric material is selected from the group consisting of vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-trifluoroethylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropene terpolymer, vinylidene fluoride-hexafluoropropene copolymer, vinylidene fluoride-pentafluoropropene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, poly-2,2,2-trifluoroethyl methacrylate, poly-1,1,1,3,3,3-hexafluoro-2-propyl methacrylate, poly-1,1-diethyl-2,2,3,4,4,4-hexafluoro-1-butyl methacrylate, poly-1-propyl-2,2,3,4,4,4-hexafluoro-1-butyl methacrylate, poly-1,1-diethyl-3-trifluoromethyl-2,2,4,4,4-pentafluorobutyl methacrylate, poly-2-trifluoromethyl-2,3,3,3-tetrafluoropropyl methacrylate, poly-1,1-dimethyl-2,2,3,3-tetrafluoropropyl methacrylate and poly-2-trifluoromethyl-3,3,3-trifluoropropyl methacrylate.
Claim 6
Dependent Claim
16 words
An optical fiber according to claim 1, wherein the transparent polymeric material is a thermoplastic fluororubber.
Claim 7
Dependent Claim
18 words
An optical fiber according to claim 1, wherein the deuterated methyl methacrylate is d 3 -d 8 -analogs.
Claim 8
Dependent Claim
37 words
An optical fiber according to claim 1, wherein the core polymer further comprises less than 5% by weight of a comonomer selected from C 1 -C 4 alkyl acrylate, deuterated alkyl acrylate, deuterated styrene or mixtures thereof.
Claim 9
Dependent Claim
19 words
An optical fiber of claim 1, wherein the reflective index of the transparent polymeric material is 1.43 or less.
Claim 10
Dependent Claim
14 words
An optical fiber of claim 1, wherein the transparent polymeric material is substantially amorphous.
Claim 11
Dependent Claim
25 words
An optical fiber of claim 1, wherein the weight ratio of the core polymer to the transparent polymeric material is from about 70:30 to 98:2.
Claim 12
Dependent Claim
25 words
An optical fiber of claim 1, wherein the weight ratio of the core material to the transparent polymeric material is from about 80:20 to 95:5.
Claim 13
Dependent Claim
18 words
An optical fiber of claim 1, which comprises a diameter of from about 0.15 mm to 1.5 mm.
Claim 14
Dependent Claim
18 words
An optical fiber of claim 1, which comprises a diameter of from about 0.20 mm to 1.0 mm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |